锰钴氧化物/多孔碳复合催化剂电催化固氮性能研究

Research on Electrocatalytic Properties of Mangano-cobalt Oxide/Porous Carbon Composite Catalyst for Nitrogen Fixation

通过简单的水热法后碳化工艺成功制备锰钴氧化物/多孔碳(Mn_(x)Co_(3-x)O_(4)/PC)复合催化剂。结果表明,由金属-有机框架材料前驱体制备的多孔碳笼均匀分布在Mn_(x)Co_(3-x)O_(4)纳米针表面。锰原子的掺杂为氮活化提供了活性中心,通过引入多孔碳可以促进氮气的吸附和电子从还原态氮态到氨态的转移。制备的珠状Mn_(x)Co_(3-x)O_(4)/PC复合催化剂的催化性能得到了提高。在0.1 mol·L^(-1)的Na_(2)SO_(4)溶液中,复合催化剂在-0.2 V(vs RHE)时其氨产率最高可达3.81×10^(-11) mol·s^(-1)·cm^(-2),法拉第效率达到5.44%。

Manganese-cobalt oxide/porous carbon(Mn_(x)Co_(3-x)O_(4)/PC)composite catalysts were successfully prepared using a simple hydrothermal method followed by carbonization.The results indicate that the porous carbon cages,derived from metal-organic framework precursors,are uniformly distributed on the surface of Mn_(x)Co_(3-x)O_(4) nanoneedles.The doping of manganese atoms provides active centers for nitrogen activation,and the introduction of porous carbon facilitates the adsorption of nitrogen and the transfer of electrons from the reduced nitrogen state to the ammonia state.The catalytic performance of the prepared bead-like Mn_(x)Co_(3-x)O_(4)/PC composite catalyst was enhanced.The composite catalyst achieved a maximum ammonia production rate of 3.81×10^(-11) mol·s^(-1)·cm^(-2) at-0.2 V(vs RHE),with a Faradaic efficiency of 5.44%in 0.1 mol·L^(-1) Na_(2)SO_(4) solution.